

/*
if (typeof item.isChecked == "undefined") {
  this.$set(item, "isChecked", true); //局部注册对象属性
} else {
  item.isChecked = this.isCheckedAll;
}
*/
/*
function f(obj, key, value) {
  if (obj.hasOwnProperty(key)) {
    obj[key] = value;
  } else {
    this.$set(obj, key, value);
  }
}
*/


